Table 7. Comparison of Classification Accuracy by Using All Frequency Bands Base on Correlation, Coherence and Phase Synchronization Index (PSI) With and Without Feature Selection.

	Without feature selection	With feature selection
	Mean (S.D.)	Mean (S.D.)	p
Correlation	0.43(0.04)	0.61 (0.03)**	2.22×10−47
Coherence	0.44 (0.03)	0.62 (0.04) **	3.32×10−47
PSI	0.52 (0.06)	0.82 (0.06) **	9.48×10−38

Note: **Accuracy with feature selection is significant higher than that without feature selection, p<.01.